An independent expenditure committee calling itself "San Diegans in Support of Bob Filner for Mayor - 2012" has collected a total of $607,500 from labor unions, a wealthy local Democrat, and a corporation sharing an address with La Jolla's premier luxury car dealership, among others.

According to a disclosure filing, dated October 4 and posted online by the San Diego City Clerk, the group spent $249,073, much of it on television and radio advertising purchases, through the end of September, leaving it with an ending cash balance of $358,426.

The second biggest donor was an entity identified by the disclosure as South Beach Acquisitions of La Jolla, with $120,000 on September 27.

State records show that South Beach Acquisitions, Inc. is a California corporation with an address of 7440 La Jolla Boulevard.

Other entities at the same address include the La Jolla Children’s Foundation, a small non-profit corporation headed by Marc and Ruth Chase, according to its 2011 annual filing with the U.S. Internal Revenue Service.

"Symbolic Motor Car was launched 14 years ago by Bernie and Marc Chase, a pair of high-strung brothers from Los Angeles afflicted with Southland car culture to the point of neurosis.

"One by one they bought and sold increasingly more exotic cars--Symbolic owns all of its stock and does not sell on consignment--until eventually their remarkable savvy made them the largest dealer of collectible and performance cars in the world.

"Steve McQueen's Ferrari 275, Elvis Presley's BMW 507, Sophia Loren's Rolls-Royce: Sooner or later the most exotic cars have ended up with the Chase brothers."

Lawrence Hess, a wealthy donor to Democratic causes, gave $10,000 to the Filner committee on September 27.